TY - JOUR
T1 - Nonreactive Scattering of N2 from Layered Graphene Using Molecular Beam Experiments and Molecular Dynamics
AU - Mehta, Neil A.
AU - Murray, Vanessa J.
AU - Xu, Chenbiao
AU - Levin, Deborah A.
AU - Minton, Timothy K.
N1 - Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/5/10
Y1 - 2018/5/10
N2 - Conventional gas surface interaction (GSI) models and molecular dynamics (MD) simulations have been compared with angular distributions and average translational energies for N2 scattered from highly oriented pyrolytic graphite (HOPG) measured by angle and velocity resolved molecular beam scattering experiments. The translational energy and angular distributions of the scattered N2 were obtained for incidence energies near 30 and 68 kJ mol-1, incidence angles of 30°, 45°, and 70°, and a surface temperature of 677 K. The trajectories of scattered nitrogen molecules were found to fall into three main categories, i.e., single collision, multiple collisions with escape, and multiple collisions without escape. While the conventional GSI models did not match the translational energy and angular distributions obtained from the experiments, the results obtained from MD simulations were found to be in good agreement. The MD simulations also showed that the number of surface layers used to model the HOPG surface and the carbon-nitrogen Lennard-Jones potential are important in improving the agreement between the simulations and the experiments.
AB - Conventional gas surface interaction (GSI) models and molecular dynamics (MD) simulations have been compared with angular distributions and average translational energies for N2 scattered from highly oriented pyrolytic graphite (HOPG) measured by angle and velocity resolved molecular beam scattering experiments. The translational energy and angular distributions of the scattered N2 were obtained for incidence energies near 30 and 68 kJ mol-1, incidence angles of 30°, 45°, and 70°, and a surface temperature of 677 K. The trajectories of scattered nitrogen molecules were found to fall into three main categories, i.e., single collision, multiple collisions with escape, and multiple collisions without escape. While the conventional GSI models did not match the translational energy and angular distributions obtained from the experiments, the results obtained from MD simulations were found to be in good agreement. The MD simulations also showed that the number of surface layers used to model the HOPG surface and the carbon-nitrogen Lennard-Jones potential are important in improving the agreement between the simulations and the experiments.
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U2 - 10.1021/acs.jpcc.7b11721
DO - 10.1021/acs.jpcc.7b11721
M3 - Article
AN - SCOPUS:85046959506
SN - 1932-7447
VL - 122
SP - 9859
EP - 9874
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 18
ER -